如何防止参数绑定解释 Spring 3.0.5 中的逗号?

问题描述

考虑以下控制器方法:

@RequestMapping(value = "/test", method = RequestMethod.GET)
public void test(@RequestParam(value = "fq", required = false) String[] filterQuery) {
    logger.debug(fq = " + StringUtils.join(filterQuery, "|"));
}

这是不同fq组合的输出:

1. /test?fq=foo 结果为 fq = foo
2. /test?fq=foo&fq=bar 结果是 fq = foo|bar
3. /test?fq=foo,bar 结果为 fq = foo|bar
4. /test?fq=foo,bar&fq=bash 结果为 fq = foo,bar|bash
5. /test?fq=foo,bar&fq= 结果为 fq = foo,bar|

1. /test?fq=foo results in fq = foo
2. /test?fq=foo&fq=bar results in fq = foo|bar
3. /test?fq=foo,bar results in fq = foo|bar
4. /test?fq=foo,bar&fq=bash results in fq = foo,bar|bash
5. /test?fq=foo,bar&fq= results in fq = foo,bar|

示例 3 是问题所在.我希望(想要/需要)它输出 fq = foo,bar.

Example 3 is the problem. I expect (want/need) it to output fq = foo,bar.

我试过用 转义逗号并使用 %3C 但都没有工作.

I've tried escaping the comma with and using %3C but niether work.

如果我查看 HttpServletRequest 对象的版本:

If I look at the HttpServletRequest object's version:

String[] fqs = request.getParameterValues("fq");
logger.debug(fqs = " + StringUtils.join(fqs, "|"));

它打印预期的输出:fqs = foo,bar.所以问题"在于 Spring 数据绑定.

It prints the expected output: fqs = foo,bar. So the "problem" is with the Spring data binding.

我可以绕过 Spring 的绑定并使用 HttpServletRequest 但我真的不想，因为我在我的真实代码中使用了 backing bean(同样的事情正在发生)并且不希望重新实现绑定功能.我希望有人可以通过转义或其他一些机制提供一种简单的方法来防止这种行为.

I could by-pass Spring's binding and use HttpServletRequest but I really don't want to as I'm using a backing bean in my real code (same thing is happening) and don't wish to re-implement the binding functionality. I'm hoping someone can provide a simple way of preventing this behavior via escaping or some other mechanism.

TIA

更新:我在 Twitter 上发布了这个问题，并得到回复说预期的输出出现在 Spring 3.0.4.RELEASE.我现在已经确认是这种情况，因此是一个临时修复.我将继续将此记录为 Spring JIRA 系统上的错误.如果有人可以提供解决方法或修复 3.0.5，我会接受他们的回答.

UPDATE: I posted this Q on Twitter and got a reply saying the expected output appears with Spring 3.0.4.RELEASE. I've now confirmed this is the case and thus is a temporary fix. I'll go ahead and log this as a bug on the Spring JIRA system. If anyone can provide a work around or fix with 3.0.5, I'll accept their answer.

推荐答案

我已经测试了您的代码:难以置信，但我无法重现您的问题.我已经下载了最新版本的spring(3.0.5)，这是我的控制器:

I've tested your code: it's unbelievable, but I can't reproduce your issue. I've downloaded the latest version of spring (3.0.5), this is my controller:

package test;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/test/**")
public class MyController {

    private static final Logger logger = Logger.getLogger(MyController.class);

    @RequestMapping(value = "/test/params", method = RequestMethod.GET)
    public void test(SearchRequestParams requestParams, BindingResult result) {
    logger.debug("fq = " + StringUtils.join(requestParams.getFq(), "|"));
    }
}

这是我的 SearchRequestParams 类:

this is my SearchRequestParams class:

package test;

public class SearchRequestParams {
    private String[] fq;

    public String[] getFq() {
    return fq;
    }

    public void setFq(String[] fq) {
    this.fq = fq;
    }
}

这是我的简单弹簧配置:

and this is my simple spring configuration:

<bean id="urlMapping" class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

<bean class="test.MyController" />

<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix">
        <value>/WEB-INF/jsp/</value>
    </property>
    <property name="suffix">
        <value>.jsp</value>
    </property>
</bean>

我已经在 tomcat 7.0.8 中测试了我的代码；当我输入 http://localhost:8080/testweb/test/params.htm?fq=foo,bar 我能够在我的日志文件中读取这一行:DEBUG fq =foo,bar.我的代码和你的有什么不同?难道我做错了什么?我很乐意帮助你，所以如果你有任何疑问，或者我可以为你做一些其他的测试，我会很高兴.

I've tested my code within tomcat 7.0.8; when I type http://localhost:8080/testweb/test/params.htm?fq=foo,bar I'm able to read in my log file this line: DEBUG fq = foo,bar.What are the the differences from my code to yours? Am I doing something wrong?I'd like to help you, so if you have any doubts or if I can do some other tests for you, it will be a pleasure.

更新/解决方案
我用你的代码重现了这个问题；您的调度程序 servlet 配置中有标记 <mvc:annotation-driven/>，因此您可以静默地使用默认转换服务，即 FormattingConversionService 的实例，其中包含一个从 String 到 String[] 的默认转换器，使用逗号作为分隔符.您必须使用不同的转换服务 bean，其中包含您自己的从 String 到 String[] 的转换器.你应该使用不同的分隔符，我选择使用;"因为它是查询字符串中常用的分隔符 ("?first=1;second=2;third=3"):

UPDATE / SOLUTION
With your code I've reproduced the issue; you have the tag <mvc:annotation-driven /> in your dispatcher servlet configuration, so you silently use a default conversion service, instance of FormattingConversionService, which contains a default converter from String to String[] that uses comma as separator.You have to use a different conversion service bean containing your own converter from String to String[]. You should use a different separator, I've choosed to use ";" because it's the separator commonly used into query string ("?first=1;second=2;third=3"):

import org.springframework.core.convert.converter.Converter;
import org.springframework.util.StringUtils;

public class CustomStringToArrayConverter implements Converter<String, String[]>{
   @Override
    public String[] convert(String source) {
        return StringUtils.delimitedListToStringArray(source, ";");
    }
}

然后你必须在你的配置中指定这个转换服务 bean:

Then you have to specify this conversion service bean in your configuration:

<mvc:annotation-driven conversion-service="conversionService" />

<bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
    <property name="converters">
        <list>
            <bean class="au.org.ala.testspringbinding.CustomStringToArrayConverter" />
        </list>
    </property>
</bean>

问题已解决，现在您应该检查是否有任何副作用.我希望你的应用程序不需要从 String 到 String[] 的原始转换(用逗号作为分隔符).;-)

The issue has fixed, now you should check for any side effects. I hope you don't need in your application the original conversion from String to String[] (with comma as separator). ;-)

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